function s1_goto_dir(){
	cd "$1"
}
function s2_touch_empty_file_with_given_name(){
	touch "$1"
}
function s3_make_directories(){
	mkdir -p projects/git projects/backup
}
function s4_create_6_files(){
	touch projects/linux1_centos projects/linux1_redhat projects/linux1_c_programming projects/linux2_centos projects/linux2_redhat projects/linux2_c_programming
}
function s5_make_directories_in_git(){
	mkdir -p projects/git/linux1
	mkdir -p projects/git/linux2
}
function s6_move_files_to_dir_1_or_2(){
	mv projects/linux1_* projects/git/linux1/
       mv projects/linux2_* projects/git/linux2/	
}
function s7_create_package_and_compress(){
       tar -czvf projects/backup/git.tar.gz -C projects git
}
function s8_delete_dir_git(){
	rm -r projects/git
}
function s9_recover_from_git_tar_gz_backup(){
	tar -zxvf projects/backup/git.tar.gz -C projects
}
function s10_create_package_and_compress(){
	tar -jcvf projects/backup/git.tar.bz2 -C projects git
}
function s11_find_and_sort_alphabetically_all_created_files_and_dirs(){
	find ./projects | sort
}
function s12_get_next_15_minutes_boundary(){
	timestamp=$(date +%s)
	next15=$(( (timestamp + 14*60)/(15*60) * (15*60) ))
	date -d "@$next15" +"%Y-%m-%d_%H:%M:%S"
}
